At present, MetroForm doesn’t have support to customize the ControlBox button bounds and appearance. However, it is possible to achieve the required appearance by using Caption Images support and handling the below events.

ImageMouseMove

This event is raised when the mouse pointer moves within the caption image and displays the ToolTip.

ImageMouseUp

This event is raised when the mouse pointer is over the caption image and a mouse button is released and performs the required action.

ImageMouseEnter

This event is raised when the mouse pointer enters the caption image and highlights the color of the CaptionImage.

ImageMouseLeave

This event is raised when the mouse pointer leaves the caption image and shows the default color of the CaptionImage.